Its been a while since I have had one rebuilt but the last time was around $200/ but way cheaper than 600 + for new one from stinger or some other brand. Use a sealed High amperage gel cell battery like the Blue top. Very good for your application however, depending on your car you may have to relocate it to the rear.
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Steve Baker
Owner / Builder
P.S.
"If you don't know what you are doing, at least do it neatly"